Apparent phase velocities obtained by noninvasive pressure measurements
with tonometers at the carotid and radial arterial sites in normal and hypertensive adults.
(From Li et al.
frequency amplitudes and greater oscillations at higher
frequencies can be seen.
the Propagation Constant
Experimental determination of the apparent propagation constant is
simpler than that of the true propagation constant. The former can be
determined by simultaneously measuring either
pressures for the
pressure pulse, or
flows for the flow pulse. Determination of the
true propagation constant which is independent
wave reflections, in
the presence of reflections, however, requires simultaneous measurement
of three variables.
Several methods are available to determine the true propagation
which are based on linear transmission theory. From the
definition of the propagation constant as
relates to longitudinal